compositor worker: Use a WebThread for the compositor thread.

components/html_viewer/blink_platform_impl.cc

Index: components/html_viewer/blink_platform_impl.cc
diff --git a/components/html_viewer/blink_platform_impl.cc b/components/html_viewer/blink_platform_impl.cc
index 207ff81cd7ed2ddc7d409cfeda2b0b8af09a3f9f..c3d5d1a2a9e89321821ee3502a712a648e2bc5b3 100644
--- a/components/html_viewer/blink_platform_impl.cc
+++ b/components/html_viewer/blink_platform_impl.cc
@@ -255,6 +255,7 @@ bool BlinkPlatformImpl::isReservedIPAddress(
 blink::WebThread* BlinkPlatformImpl::createThread(const char* name) {
   scheduler::WebThreadImplForWorkerScheduler* thread =
       new scheduler::WebThreadImplForWorkerScheduler(name);
+  thread->Init();
   thread->TaskRunner()->PostTask(
       FROM_HERE, base::Bind(&BlinkPlatformImpl::UpdateWebThreadTLS,
                             base::Unretained(this), thread));